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Method and systems using quasi-synchronous distributed CDD systems

  • US 10,063,306 B2
  • Filed: 10/24/2016
  • Issued: 08/28/2018
  • Est. Priority Date: 10/24/2016
  • Status: Active Grant
First Claim
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1. A communication system, comprising:

  • a cyclic delay diversity (CDD) scheme having a set of spatially distributed cooperating transmitters to transmit a message, wherein operations of the set of transmitters are synchronized with an accuracy bound by a synchronization error; and

    a controller communicatively connected to each transmitter in the set of transmitters, wherein the controller is configured to;

    determine a tap delay for a communication channel between a receiver and each transmitter in the set of transmitters to produce a set of tap delays;

    determine a minimal length of a cyclic prefix as a function of a sum of the synchronization error and a maximal tap delay in the set of tap delays;

    determine a length of the message;

    determine a number of transmitters for transmission of the message, based on the determined length of the message and the minimal length of the cyclic prefix, so as to obtain a maximum number of transmitters for transmission;

    select the maximum number of the transmitters from the set of transmitters to form a subset of transmitters based upon a magnitude of channel gains;

    determine a delay of transmission for each transmitter in the subset of transmitters, based on the minimal length of the cyclic prefix; and

    control, via an output device, at least some transmitters in the set of transmitters to transmit the message to the receiver using the CDD scheme with the cyclic prefix having at least the minimal length.

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